. Turkey Lake as a unit of environment, and the variation of its inhabitants ... Biology; Natural history. 289 10. The range of variation in the total number of dorsal spines and rays combined is one greater than the variation in the fins separately. 11. The number occurring most frequently is 29 in Turkey Lake and 30 in Tippecanoe Lake. 12. The preference shown for a given number is less decided for the two dorsal fins taken together than for the dorsal fins taken separately. 13. The variation is in all cases continuous. THE VARIATION IN TURKEY LAKE. Many of the facts on the extent and charac
. Turkey Lake as a unit of environment, and the variation of its inhabitants ... Biology; Natural history. 289 10. The range of variation in the total number of dorsal spines and rays combined is one greater than the variation in the fins separately. 11. The number occurring most frequently is 29 in Turkey Lake and 30 in Tippecanoe Lake. 12. The preference shown for a given number is less decided for the two dorsal fins taken together than for the dorsal fins taken separately. 13. The variation is in all cases continuous. THE VARIATION IN TURKEY LAKE. Many of the facts on the extent and character of the variation of the 600 specimens from Turkey Lake, taken as a. whole, have been given in the pre- ceeding. The lengths of the 600 specimens from Turkey Lake were measured and upon comparison were found to fall into three quite distinct groups. Fig. 5 represents the curve for all. Each of the smaller horizontal distances represents one mm. and each of the larger verticle distances one per cent. The sizes ranged from 27 mm. to 102 mm. The first group ranges from 27 mm. to 60 mm.; the second from 60 mm. to 80 mm., and the third from 79 mm. to 103 mm. The three curves of Fig. 5 represent these three groups. I have watched the growth during the first summer, and know the first curve to represent the first summer's fish. The second curve in all probability represents the second year's fish, and the third curve, those three years old and over. The growth, thus, is most rapid during the first sum- mer, the rate of growth decreasing each year after. The fish reaches practically its full size the third year, though the more gradual slope to the right of the last curve shows that it does not cease growing ®\ i 1 szs:0: m 30 35 40 45 50 55 SO 65 70 75 60 85 90 S5 100 PlO. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly rese
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